Yep, definitely before. It helps accuracy in cutting as well as piecing. There are lots of threads on this site for starching if you do a search. I use the Sta-flo liquid from Wal-mart 50/50 with water in a spray bottle, love that stuff. There are also recipes on here for homemade and Best Press is nice too, but pricey. I spray quite heavily and let pretty much dry before ironing my fabric yardage (no flaking and less distortion of fabric).